Tetsu comes and asks the Sket-dan to meet with someone in his place. It seems like a sickly girl who he was exchanging messages with under a false persona wants to come see him...
you should be 
able to return it during the "cooling-off" period of 8 days.
deberías tener un periodo de 
ocho días para regresarlo.
deberías tener un periodo de 
ocho días para devolverlo.
você deve conseguir 
devolver dentro de 7 dias.